[cdn_swordfish@hotmail.com]

Hi Andrea my site wordpress mu

Close to the main blog register form?
let users simply register their chosen sub-blogs.
A blog a member of the user to register are other blogs

Example: http://www.expamle.com / register (note the register form) (redirect 404.php)
sub-blog: autos.example.com / register
members should not enter the other blogs this blog

[cdn_swordfish@hotmail.com]

main blog: http://example.com (not register)
sub-blog: http://auto.example.com (register)

get off the main blog entries

just let the user choose and write the blog could become a member.
Enter the not main blog and other blogs

[cdn_swordfish@hotmail.com]

okay,very good psycolor but
http://autos.example.com a user is registered, but the main blog
How can we prevent that is a sign http://example.com?